2021 Tax Deadlines for Startups

Here are 2021 tax deadlines for startups including U.S. Federal tax filing dates, and key tax dates for San Francisco, New York, and Seattle.

You can estimate your tax preparation costs using our Startup Tax Preparation Cost Calculator.

2021 Tax Calendars

2021 U.S. Tax Deadlines for Startups


San Francisco 2021 Tax Deadlines For Startups


New York 2021 Tax Deadlines For Startups

  • JAN 31:
  • MAR 1:
  • MAR 15:
    • Federal and NY state and NYC  income tax return for S-Corp and Partnership; or
    • Federal and NY state and NYC  income tax extension filing for S-corp and Partnership
    • New York State and NYC estimated tax payment
  • MAR 20:
    • Quarterly Sales and Use tax filing
  • APR 15:
    • Federal and NY state and NYC  income tax return for C-Corp and individual; or
    • Federal and NY state and NYC  income tax extension filing for C-Corp and individual
  • APR 30:
    • R&D Tax Credit Form 941 to claim R&D credit against payroll taxes
    • Quarterly Sales and Use tax filing MAY 31: New York City Business Registration
  • JUN 1:
  • JUN 15:
    • New York State and NYC estimated tax payment
  • JUN 20:
    • Quarterly Sales and Use tax filing
  • JUL 31:
    • R&D Tax Credit Form 941 to claim R&D credit against payroll taxes
    • Quarterly Sales and Use tax filing
  • SEPT 1:
  • SEPT 15:
    • Federal and NY state and NYC income tax return for S-Corp and Partnership with filed extension
    • New York State and NYC estimated tax payment
  • SEPT 20:
    • Quarterly Sales and Use tax filing
  • OCT 15:
    • Federal and NY state and NYC income tax return for C-Corp and individual with filed extension
  • OCT 31:
    • R&D Tax Credit Form 941 to claim R&D credit against payroll taxes
    • Quarterly Sales and Use tax filing
  • DEC 1:
  • DEC 15:
    • NY and NYC estimated tax payment deadline for 2020 Q4
  • DEC 20:
    • Quarterly Sales and Use tax filing
  • VARIABLE:

Seattle 2021 Tax Deadlines For Startups

  • JAN 31:
    • R&D Tax Credit Form 941 to claim R&D credit against payroll taxes
    • 1099s and W-2s
    • 3921 and 3922 Stock Options Exercise reporting
    • Quarterly Sales and Use tax filing
    • Seattle 2019 Business License Tax deadline for Annual Filers
    • Seattle Q4 2019 Business License Tax for Quarterly Filers
    • Washington Q4 (prior year) State Fund Quarterly Report (Payroll Tax)
  • MAR 1:
  • MAR 15:
    • Federal income tax return for S-Corp and Partnership; or
    • Federal income tax extension filing for S-corp and Partnership
  • APR 15:
    • Federal income tax return for C-Corp and individual; or
    • Federal income tax extension filing for C-Corp and individual
    • Washington Annual or Q1 2019 Excise Tax Return (Business & Occupation Tax, Sales Tax, & Use Tax).
  • APR 30:
    • R&D Tax Credit Form 941 to claim R&D credit against payroll taxes
    • Seattle Q1 2020 Business License Tax for Quarterly Filers
    • Washington Q1 2020 Excise Tax Return
    • Washington Q1 2020 State Fund Quarterly Report (Payroll Tax)
    • Washington Personal Property Tax Listing Form and 50% of property taxes
  • JUN 1:
  • JUL 31:
    • R&D Tax Credit Form 941 to claim R&D credit against payroll taxes
    • Seattle Q2 2020 Business License Tax for Quarterly Filers
  • JUL 31:
    • Washington Q2 2020 Excise Tax Return
    • Washington Q2 2020 State Fund Quarterly Report (Payroll Tax)
  • SEPT 1:
  • SEPT 15:
    • Federal and State income tax return for S-Corp and Partnership with filed extension
  • OCT 15:
    • Federal and State income tax return for C-Corp and individual with filed extension
  • OCT 31:
    • R&D Tax Credit Form 941 to claim R&D credit against payroll taxes
    • Seattle Q3 2020 Business License Tax for Quarterly Filers
    • Washington Q3 2020 Excise Tax Return
    • Washington Q3 2020 State Fund Quarterly Report (Payroll Tax)
    • Remaining 50% of Washington Personal Property Tax
  • DEC 1:
  • VARIABLE:
    • Renew your business license annually

 


Burkland provides expert CFO services, accounting services, and tax services to startups across the United States. Reach out to us to learn more about how we can help your startup or portfolio company.